In general, the normal value of bone age for the normal age plus or minus two years, the age of the child age eight years old bone age 5.5 years, suggesting that the bone age lagging behind, at this time, such as height in the normal range, or the annual height growth is greater than 5cm, can be supplemented through the nutrition, strengthen the physical exercise, etc. to promote the development of bones, such as the child has a lack of growth hormone or hypothyroidism, then need to be in time for hospital consultation. 1. Supplementary nutrition: to ensure that children eat a balanced diet, avoid partiality, picky eating, more fresh fruits, vegetables, and a variety of meat, milk and high calcium food, avoid high-calorie, high-sugar carbonated beverages and fast food. 2. Physical exercise: Bouncing and stretching exercises can promote the growth and development of bones and muscles, as well as height growth. In addition, more sunshine and appropriate calcium supplements are beneficial to bone growth. 3. Ensure adequate sleep: Early to bed and early to rise can promote the secretion of growth hormone, and at the same time, the combination of work and rest can help the growth hormone function in the body. If your child has a growth hormone deficiency or hypothyroidism that causes bone age to fall behind, you should consult a pediatrician in a timely manner and apply growth hormone or thyroxine tablets if necessary. In conclusion, when the child is behind in bone age, it is recommended to consult the pediatrician in time to clarify the cause of the disease and take targeted treatment.